Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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How to power RPi with fan from single source?

Electronics beginner here. I have Raspberry Pi 4 GB variant. I have the following power requirements: power a 5V cooling fan 12V cooling fan (a spare cooler master)thanks @Milliways safely (i.e. ...
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Using USB-C on Pi 4 while powering the Pi via GPIO header pins?

I have an Pi 4 that I have setup as a router. I am using USB-C in Ethernet gadget mode to connect to my computer. I want to be able to disconnect and reconnect the Pi from my computer without it ...
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45 views

Use MacBook charger for Raspberry Pi 4

I am using the official 15.3W USB-C Power Supply to power up my Raspberry Pi 4. I got my self a second Raspberry Pi 4 but I haven't bought the power supply yet. Would I be able to use the Macbook ...
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UPS for Pi 3B and hdd

I'm quite new to the Pi world, but I need a UPS unit to power both a Raspberry Pi 3B and a 2.5'' hard disk used by the Pi. I thought a power bank could be the right choice for me, but I cannot find a ...
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Testbench for Raspberry Pi

I've owned Pi's since the first generation and have had various test rigs made from what I had to hand including stepping the voltage down from 12v and various bits of lego holding the components in ...
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Can I power two Pi from a single Lithium battery?

I need to run at least 2 Pi together, one controlling hardware and another sensing its environment. I would like to keep weight down by using a single LiIon battery. I have one to connect to a PiJuice ...
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74 views

Is it possible to power IR light module from 3.3v GPIO

Welcome, i've got a question that is bugging me for quite some time lately. I've got RaspberryPi zeroW with ZeroCam camera module (without IR filter). To get it to work in dark I bought IR LED ...
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334 views

What are the max current rating for 3.3v and 5v rail of the Rpi 4B

Does anybody know the max current rating of the 3.3v and 5 v rail of the new raspberry pi 4? i could not seem to find anybody benchmark this, i have read from someone that the new RPI 4 has a new ...
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1answer
59 views

USB-C to USB-C Cable Recommendations for Pi 4

Based on the USB-C implementation issue in Pi 4 rev. 1, I'm looking for recommendations on a non e-marked USB-C cable to use for power. Having dug through my own cable stash, I've found a couple of ...
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67 views

Regularly power up an autonomous Raspberry Pi? (e.g. once a week)

I want to power a Raspberry PI from a power bank, which should give me - according to various sources on the Internet - 30 to 70 hours of operation. How can I power up the Raspberry Pi once a week to ...
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raspberry pi 4 doesn't boot [duplicate]

I have a raspberry pi 4 which was working and suddenly turned off and ever since isn't booting up. Red and Greeen LED is continously on.(Not blinking) I have tried another memory card with differnt OS ...
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59 views

Rpi4B can control either one of two L298N modules, each driving two motors, but not both modules at the same time, why?

I'm using a pi 4 for a rover I want to build and I have 2 L298N drivers. I connected them using a breadboard to my pi so I don't need that much GPIO pins but only one pair of motors is working and ...
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Rpi GPIO pins + 2N2222 to independently drive two DC12V fans

I'm pretty new to Pi and electronics. I need to use my Pi as fans controller. I got two 12V fans and need to control it from Pi. I want to use external power supply (12V) to give them propper power. ...
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Powering solenoid from batterypack

Im trying to power my 6V solenoid that is connected to my 8 channel 5V relay using my 8 x AA batterypack. The pi is being powered through an adapter and the relay from the VCC to 5V pi. When the LED ...
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persistent canbus data logging during power loss

I am trying to setup a robust raspberry canbus data logger. The pi will be installed on a mobile vehicle where the power to the pi is disconnected every time the vehicle is switched off, which will ...
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61 views

How to determine the power state of the connected monitor

Main Question: Can my raspberry pi (powered on it's own) determine if power is being supplied to the monitor (powered by a wall plug)? I'm trying to determine the power state of the display that is ...
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2answers
678 views

Can a Raspberry Pi 4 power an external HD?

I was not able to power an external HD directly from a Raspberry pi 3 (the HD was constantly complaining about a lack of power). Would a Raspberry Pi 4 be able to power a portable hard drive (using ...
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33 views

USB Power Draw Plug In Order

I'm having some issues running a USB webcam and a USB speaker at the same time. If I plug in my webcam second, both devices work perfectly fine. If I simply boot with both plugged in, the speaker ...
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3answers
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RaspberryPi turns on but wont start

So I come home and the power strip in which I left the RaspberryPi has tripped and it was off. I restart it, but I notice that the RaspberryPi wasn't giving any output when I plugged the monitor in. I ...
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Prevent under-voltage warnings from printing to the console

My Pi occasionally experiences an undervoltage for a second. I am working on fixing it but my main concern is that my Pi is being used in a kiosk application that displays a text output to the ...
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2answers
233 views

Rpi4B power connector SMD components damaged. How to replace it?

I broke what looks to be either a diode, capacitor or resistor on the board near the power connector of the pi 4B and I want to try to replace the surface mounted component. I know the chances are ...
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The best way to connect the 7” touchscreen

I have a pi 3 model B+ and the official raspberry Pi PSU, and the official 7” touch screen. I’m running Raspbian with all the latest updates. I have connected the display using a USB cable as ...
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59 views

About Power supply for Pi 4b [duplicate]

I have bought Pi 4b but now I don't wanna buy separate power adapter for it, I already have 5V,4A power adapter of my smartphone so can I use it for Pi 4b also??
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1answer
53 views

Will this work out (usb hub + rpi zero w + Zishan Z1 DSD)?

Well, I want to connect Rpi zero W and Zishan Z1/2 DSD in one case, but with both devices working in one port connected to PC. (with working usb device in Rpi if in "portable" mode or in both ...
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Raspberry Pi Losing Power

I bought a Raspberry Pi that had the entire n64 library loaded onto it. it takes an HDMI cable to plug into the TV and has a regular USB to micro USB for the power. I start it up and it begins to boot ...
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101 views

Pi 3 w/Pisound - Won't turn on unless wait a few minutes

I have a Pi 3 and Pisound (hat) and to turn it off I just unplug the cable. Now oddly, if I plug it back in right away I just get a red light, no blinking yellow BUT If I wait a few minutes to plug it ...
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1answer
49 views

Does a battery pack exists which does not need the microUsb power connection? [closed]

I'm building a small robotic car, which obviously needs battery power for it and the RPi. I've no problem with the battery pack for the car since it fits neatly into the chassis, but the RPi microUsb ...
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30 views

Fast turn off of a Pi in embedded applications [duplicate]

Is there any documentation about what the Pi is actually doing during its (excruitatingly) slow power down ? I want to build a Pi4 into a product that will definitely have the power cord pulled on a ...
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1answer
604 views

Raspberry Pi 4 not turning off HDMI monitor on idle

In the past, the Raspberry Pi computers could be made to turn off the monitor (as opposed to leaving the backlight on with a blank screen) when the Pi turned the screen off on inactivity. This could ...
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1answer
28 views

Using Both +5V GPIO Pins for More Current?

According to this website: https://pinout.xyz/pinout/pin2_5v_power# The +5V GPIO pins can push up to 1.5A of current, and are attached directly to the Pi's power supply. My question is, if I use ...
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153 views

power supply for multiple raspberry pi4

I am wondering if any one knows of a power supply that will power 4 or more raspberry pi4 with the type C plug? (Yes I would like the full 3 amps or more) I thought of a standard ATX power supply, ...
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Voltage drop when RaspberryPi boots

Im trying to learn robotics with raspberrypi but im having a problem. I have 6 AA batteries in a batteryholder that are connected to a breadboard and with M-M jumping wires its connected to a LM2596S ...
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1answer
53 views

Allow more power for USB Devices?

Is there a way to allow more power to USB Devices powered by the Pi I have a model B+, and I am unable to power my Webcam plugged into the Pi it has a single USB Connection so there's no way to power ...
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1answer
49 views

Help with the logistics of powering a raspberry pi emulation box

Firstly, I'm unsure if this belongs here or in electrical engineering, but I decided on here incase anyone else has attempted a similar thing. I've had a raspberry pi and an old wooden chest lying ...
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35 views

Are there any battery backup options that work with a PoE powered Pi?

Looking to have a Pi (4) that is powered over PoE - are there any battery backup options (i.e. hats) that can be stacked with the PoE hat & supply power if/when the PoE fails (and then re-charge ...
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1answer
83 views

Battery Usage Pi Zero W for video stream

I am trying to do live video streaming from the rasberry pi, meaning the camera is recording a video and then transmitting the live video over wifi. What is the smallest battery I can use to power ...
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2answers
73 views

Test raspberry power supply

I have a raspberry pi 3 B+ and an external hdd like this one Connecting it directly to the pi makes the pi shutdown and restart I’ve tried to use an external usb hub with power but it still keeps ...
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1answer
214 views

Raspberry Pi does not reboot with powered external HDD attached

I have recently set up a Plex Media Server on a new Raspberry Pi 4 (4 Gb). This is powered using it's own official power supply, the Pi is connected via USB to a powered USB hub which has a 1TB WD ...
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829 views

RPi 3 - Reduce power consumption

I am looking to reduce the power consumption to a minimum on my RPi 3. For my project, the Raspberry Pi Zero is not an option. for now, I disabled Bluetooth and WiFi and made sure to kill some ...
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1answer
61 views

Raspberry Pi 3 b+ seemed to be dead because of excessive vlotage of around 5.5 volts. Can anybody help?

My rapsberry pi 3 b+ constantly showed the under-voltage warning, so I connected my PSU to th RPI and setted the output voltage to be around 5.5v. I measured a voltage of around 5.2v when the RPI was ...
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1answer
154 views

Powering a raspberry pi 4 using a micro usb power supply with adapters

I previously owned a raspberry pi model 3b+ and have purchased a new raspberry pi 4b (4 gigabyte ram). I have an official micro USB power supply and some micro USB to USB type C converters designed to ...
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Can the 3b+ power two usb SSD drives?

Can I power two usb drives using USB to satas or do i need a powered USB hub?
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1answer
242 views

Raspberry pi 3B+ won't boot, solid red light

My Pi won't boot, I was coding my Pi when my friend came and wanted to see a movie from the Pi, I shut it down normally and close the power supply, then changed the SD card that had kodi on and tried ...
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50 views

How can I mount a speaker on to a Pi so that it is light enough for it to be mobile

Can I mount a speaker on a mobile Pi robot together with a suitable power supply? Ideally I’d like the Pi to follow a fixed route while emitting a fixed repeating tone.
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No activity LED after shorting a GPIO to ground : dead or fixable?

This is a model 3B+, due to some under-power warnings on the screen I was testing the actual voltage between the 5V and ground pins on the header, but managed to touch pin 40 (SCLK) to pin 39 (GND) ...
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2answers
209 views

What happens to the GPIO voltage after shutdown?

I don't have a Raspberry Pi laying around at the moment and I would like to detect if my Raspberry Pi is shuted down. My Idea is that maybe after the Pi shutted down the Voltage at the 3V3 pin will ...
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1answer
78 views

I think I fried my Raspberry Pi, but I'm not sure

I was making connections from my Raspberry Pi to a relay module. While I was running some sample code, I noticed that after I had terminated the program I was still getting a high CPU usage (around 60%...
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6k views

Choosing a Pi4 power supply

I'm trying to decide what is the best option for powering a Pi4. The specs mention for a minimum of 3A. Let's consider we would also like to connect a 2.5" drive to the Pi4. Could someone more ...
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126 views

HDMI power circuit on the Raspberry Pi 4

The previous models of the Raspberry Pi used different circuits to connect its 5 V power rail to the HDMI connector, i.e. How much current can I draw from each model's HDMI socket? Especially the ...
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1answer
4k views

Powering the Pi 4 - safe voltage levels and current requirements

How to safely power the Pi 4, more specifically: What voltage levels are safe to power the Pi 4 via the USB-C connector or via the GPIO header? What are the current requirements? What Power ...